I know that you can read a lot about this topic but knowing more would hurt you not a bit!
Always find time for your partner. Don't put off a meeting with your sweetheart just because you think that you can save the company (or your colleague) by doing the 80-paged project report on your own. Don't' assume your sweetie will understand when you call with a “honey, I can't come today, because I have to work late” because it can jeopardize big time in the long run… it can all accumulate!
The logic behind it is that you two are together because you find things that interest you. In addition, by not being together often, you are losing that theme in you. It can lead to the eyes looking at someone else when you are absent… or simply because maybe there won't be any tomorrows? I don't want to be a very pessimistic person, but… I remember when a friend wanted to marry someone and when he finally made the decision, she was in the hospital dying.
Hell! There are millions of things you can do together to have fun. The most important thing is to try to do things that interest both of you. He might not be too fond of the nightclub and all that salsa dancing, but he might compromise for you (if you're good at persuading that is) or you might go to the new restaurant instead?
Don't over dream (and don't talk much about it). Believe me, some sources say to always share dreams, to daydream together, and so on... I am not saying not to do it, but… don't overdo it. You told them that you would love going to Prague someday, you daydreamed with them about your wedding day with pink roses and white satin all around… but don't go on reminding them about it every other Saturday. Remember the saying that sweet water tapping over a rock finishes by shattering it; well, try the other side of it by saying repetition causes frustration. How angry did you feel when your mother kept on telling you to clean your room? Now remember that when you restart the same story. You don't want to scare the fish away… so keep yourself cool, unless you see that it's really time to have a ring on your finger.
It's not all about romance, but understanding. Women shouldn't rethink their relationship when the flowers stop rolling in; the chocolate is not part of your diet, and when you get a Flintstone's conversation such as: “when was the last time we went out”. It's not the chocolate, the roses or the restaurant dinners that kept you together for all this time Right? I suppose you can be a bit understanding. (this was the woman's part)
Men… to you I have a different conversation: once you finally go t to date the one you love, you shouldn't really stop the roses, the poems and the cards. I know that it wasn't really all about that, but wouldn't you love to surprise her with your three roses? Believe me: no woman on this planet wouldn't appreciate a sweet gesture like that once a while. So understand as well, remember, she's a woman!
Be yourself, for someone else… this one, you should know … only you.